only use crypt.h if i_crypt is defined (and check in unistd for crypt) #146
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On FreeBSD, crypt is defined in unistd.h and crypt.h is not present. This patch allows cross builds for FreeBSD by determining whether to include crypt.h based on the i_crypt variable. It additionally adds unistd.h to the list of headers to include for testing whether crypt is available. Perl already includes unistd.h in all the places that use crypt.